Shedding light on dark DNA Most textbook definitions of evolution state that it occurs in two stages: mutation followed by natural selection. DNA mutation is a common and continuous process, and occurs completely at random.
The average adult only eats 15 grams of fiber per day. Women need 25 grams of fiber per day, and men need 38 grams per day, according to the Institute of Medicine.
The Food and Nutrition Board of the Institute of Medicine assembled an adequate intake, or AI, for total fiber. Adult men should get 30 to 38 grams of fiber each day, while adult women need 21 to 25 grams. During pregnancy and while nursing, however, you should get 28 to 29 grams of total fiber daily.This basic recommendation may be too much or too little, depending on your diet.he Food and Nutrition Board of the Institute of Medicine assembled an adequate intake, or AI, for total fiber. Adult men should get 30 to 38 grams of fiber each day, while adult women need 21 to 25 grams. During pregnancy and while nursing, however, you should get 28 to 29 grams of total fiber daily.